Set glance_host on compute nodes

Change-Id: I78001c57da4f10430aef832eb1090b4dd7b126f2
Mention ceilometer service names and alarm notifier

The alarm notifier was not documented, add it.
Add to all items the name of the daemon like we do in other parts
of the getstart sections.

Change-Id: Icdd5b3588d3ea733cfc746a6d101534c4be7b777
Closes-Bug: #1238582
Merge "Set glance_host on compute nodes"
Merge "Mention ceilometer service names and alarm notifier"